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    • 2. 发明授权
    • Investment casting patterns and method
    • 投资模式和方法
    • US06481490B1
    • 2002-11-19
    • US09237435
    • 1999-01-26
    • Joseph M. VihtelicPhilip D. JacksonJiri E. KrestaKurt C. Frisch
    • Joseph M. VihtelicPhilip D. JacksonJiri E. KrestaKurt C. Frisch
    • B22C702
    • B22C7/023B22C9/043
    • Method of making a shell mold for casting molten metals or alloys involves forming a thermally collapsible, low density reaction injection molded (RIM) thermosetting polyurethane foam pattern having a shape corresponding to the casting to be made. The pattern is formulated to have an aggregate density (pattern outer skin and pattern cellular core) in the range of about 10 to 15 lbs/ft3 and a smooth continuous as-molded surface devoid of surface connected open cells, dimensional stability over a range of temperatures, and ready, ashless burnout from the shell mold formed thereon without cracking the shell mold. The pattern is free of organometallic catalysts that should not be present in the casting of aerospace superalloys, such as nickel and cobalt base superalloys and titanium. The pattern then is invested without the need for any surface polymer or other film or layer in a shell mold.
    • 制造用于铸造熔融金属或合金的壳模的方法包括形成具有与要制造的铸件相对应的形状的热可折叠,低密度反应注塑(RIM)热固性聚氨酯泡沫图案。 该图案被配制为具有在约10至15磅/平方英尺范围内的聚集密度(图案外皮和图案细胞芯),以及没有表面连接开孔的光滑连续成型表面,在一定范围内的尺寸稳定性 温度和准备好,从其上形成的壳模的无灰灼烧而不破坏壳模。 该图案没有有机金属催化剂,不应存在于航空航天超级合金(如镍和钴基超级合金和钛)的铸造中。 然后投资的模式不需要在壳模具中的任何表面聚合物或其它膜或层。
    • 10. 发明授权
    • Polyurethane elastomers having improved physical properties and a process for the production thereof
    • 具有改善的物理性质的聚氨酯弹性体及其制备方法
    • US07511111B2
    • 2009-03-31
    • US11374789
    • 2006-03-14
    • Bruce D. LawreyKurt C. FrischNigel Barksby
    • Bruce D. LawreyKurt C. FrischNigel Barksby
    • C08G18/12C08G18/10C08G18/48C08G18/32C08G18/40
    • C08G18/4866C08G18/10C08G18/3206
    • A polyol composition having a number average molecular weight of from about 1,000 to about3,000 Daltons is made up of (1) at least 55% by weight of a low monol polyoxypropylene polyol having a number average molecular weight of from about 1,000 to 12,000 Da and a degree of unsaturation less than or equal to 0.02 meq/g and (2) no more than 45% by weight of a polyol having a number average molecular weight of from about 400 to about 1,000 Da and a polydispersity index greater than1.1. This polyol composition is reacted with a diisocyanate, a polyisocyanate, an isocyanate-terminated prepolymer or an isocyanate-terminated quasi-prepolymer to produce polyurethanes, particularly, polyurethane elastomers having good physical and mechanical properties. Any of the known processes for producing polyurethanes, particularly, elastomers, including one-shot processes, may be used to produce polyurethanes in accordance with the present invention.
    • 数均分子量为约1,000至约3,000道尔顿的多元醇组合物由以下组成:(1)至少55重量%的数均分子量为约1,000至12,000Da的低一羟基聚氧丙烯多元醇 和不足于0.02meq / g的不饱和度和(2)不超过45重量%的数均分子量为约400至约1,000Da的多元醇和多分散指数大于1.1 。 该多元醇组合物与二异氰酸酯,多异氰酸酯,异氰酸酯封端的预聚物或异氰酸酯封端的预预聚物反应以制备聚氨酯,特别是具有良好物理和机械性能的聚氨酯弹性体。 用于生产聚氨酯的任何已知方法,特别是弹性体,包括一步法,可用于制备根据本发明的聚氨酯。